Danzig, E.M. 1977 On the nomenclature and distribution of some injurious scale insects (Homoptera, Coccoidea).. Entomologicheskoe Obozrenye 56: 99-102.

Notes: Also published in English in Entomological Review 56: 73-75; distinguishing characters between Planococcus ficus and Citri; Eulecanium tiliae; new synonyms; Aspidiotus nerii.